The partial structure of a spore germination inhibitor from a cellular slime mold, Dictyostelium descoideum was investigated. The molecular weight of this substance is 412 daltons. It contains at least N-(3-methyl-2-butenyl) adenine and an unknown α-amino acid residue. At the concentration of _??_0.03 μg/ml (_??_10-8M), this compound completely inhibited the spore germination of this organism.
